Writing device



Sept.V 26, 1944.

MV. BERLINER ET AL WRITING DEVICE Filed July.2l, 1943 INVENTORS mmf/'lv 3fm/'NER BY HFE'D 1974195 Patented Sept. 26, 1944 VWRITBTG DEVICE Martin Berliner and Alfred Matias, New York, N. Y.

,ApplieatinJulygL 1943, seria1No. 495,562

Claims.

This invention `relates to writing devices or `writing pads for permanent use, vandmore par- Aticularlyto a writing device of the aforesaid type which vis susceptible of being operated to render inscriptions on its surface readilyindiscernible or rto efface such inscriptions.

.It is one of the objects of this invention to aprovide avery eilicient and .sturdy writing device of :the aforesaid nature, which is very ysimple and .inexpensive in construction, may be easily manipulated and is light in Weight since it is practically `devoid of any metallic parts.

It is a further object of this invention to pro- .vide a device having means for guiding a movable portion of the device and for causing almost instantaneous disappearance of inscriptions on the surface of the writing device.

Still another object of the present invention iis -toprovide a writing pad whose jfrarn'e is made .from an envelope `into which a writing unit `may .be slidably inserted Aand held in position therewithin.

Yet, a further object lof the present invention .is to provide means in the form of a parting l `strip which assures reliable operation and which .interconnects said slidable writing unit with ythe envelope, said stripV being fastened to `the inside of the envelope and being hidden from outside view.

It is another object of this invention to provide :a `writing pad or device `of the aforesaid nature which is substantially made of paper and allows :ready assembly of its parts of which `it consists.

These and other objects and advantages of the invention will appear from thel following disclosure thereof together with the attacheddrawing which illustrates a certain form ofernbodiment thereof. This form is shown for the purpose of illustrating the invention since the same has lbeen found in practice to ygive satisfactory vand reliable results, although it is to be understood 4that the various instrumentalities of which `the invention consists can be variously .arranged .and organized and that the invention is 1not limited to the precise arrangementandorganization of the instrumentalities as herein shown and described.

In .the drawing:

Fig. 1 is a front yelevation of the writing ,device :made in accordance with the invention, shown in .operative position.

Fig. 2 is a similar View to Fig. 1, the vdevicebeing in partially operating position.

Fig. 3 is a rear View of Fig. ,2. .1

Fig. 4 isa perspective view of the framevof the device, the top portion 'being slightly compressed to .demonstrate the `top opening and location of securement forfthe Vparting strip of `the device.

Fig. 5 is a front elevation of the writing unit in 'the stage of being assembled.

Fig. 6 is a perspective viewfof the parting strip.

Fig. 7 is a fragmentary sectional View, taken along lines 1 1 of Fig. 5.

Fig. 8 is a sectional view, taken valong lines 8`8 of Fig.' 1.

Fig. 9 is a sectional View, taken along lines 9--9 of Fig. 1.

'In the embodiment of the invention shown in `rslidaibly arranged with .aY rcertain play between vided with a frame I6 in the form of an envelope having front wall Il with cut-out or window i8 and rear wall I9. `Front wall Il has two flaps 20 and 2l which are turned over and secured to rear wall i9, Vasclearly indicated in Fig. 3. Envelope or frame I6 is further provided with upper cut-outs 22 at the front wall I1 and rear Wall I9 to make the writing `board or unit 23 accessible to the fingers of the hand of the operator. Envelope I6 may be made of canvas, leather, paper, cardboard or any other suitable material.

VWriting unit or board proper 23 consists of a plurality of layers about to be described hereinafter.

The lowermost or base layer of the pad consists of a -base plate preferably of cardboard 24 to which is fastened by any attaching means, such as wire staples 25, the top layer or cover 26 in form of a transparent sheet 26. Between base layer 24 and top layer 26, there is slidably received assembled intermediate layers 29 consisting of black wax covered support 30, tissue or other known translucent` sheet 3| and parting Strip `32. y

Tissue lsheet 3| which is translucent loosely `overlies support or holder 30 and is provided with upper and lower flaps 3m (Fig. '7) by which tissue sheet 3l is held in vposition on the wax covered support. To this end, flaps l31a are loosely bent over the rear side of support X30. Between the surface of black wax covered support 30 and translucent tissue sheet 3l, there `is positioned .parting strip 32 which inturn is provided with lend portions or `extensions .33, 34 bent over at 35 zandl36, respectively (Fig. 6).

" The `thus vassembled .intermediate layers '29 'are .base layer 24 andtransparent top layer 26 (Fig. .-5) `resulting in the structure of the writing board .proper or 'unit 23. Writingboard .23 may then beslidablyfmounted ingenvelope or frame I'E 'by insertion of said board into its upper opening |6a, extensions 33 and 34, which were prior to the insertion bent over the rear side of the base layer 24, being thereafter attached with their surfaces 3l, 38 to the inside of the envelope at its rear wall 39 and at locations 40 and 4l thereof which are preferably provided with respective adhesive layers. Thus, the writing board proper 23 may be easily retained and held in position within envelope or` frame I6, but is permitted to slide therein, since the width of the board 23 corresponds approximately to the inside width of the envelope.

plate and a transparent cover, staples connecting said cover to said base plate at their respective upper and lower edges, and intermediate layers. loosely interposed between and retained Y sheet and above said wax coating and terminating in lateral extensions bent over the rear face of said base plate, and adhesive means xedly The writing or top surface 26 of transparent ma- Y c connecting said lateral extensions to the inner lface'o'f the rear wall of said envelope, whereby The function of the writing device l5 is well f known in the art. As can be seen in Fig. 1 any indicia or inscriptions on the top surface 26 of 23 relatively to the strip 32 which is stationary and xedly attached to frame I6 and thereby lifts the tissuer sheet 3| from the black wax coveredsurface 30.

It is to be noted that'the length of the intermediate layers 29 is somewhat shorter than the distance between the Vupper and lower pairs of wire staples 25, the latter attaching the translparent top layer or cover 26 to base plate 24.

indicia caused by compressing said tissue sheet Vagainst said wax coating may be effaced upon movementpof said writing unit within said en- -velope and past saidpaper strip.

Thus, the coecient of expansion of the tissue layer or sheet 3l and that of the wax covered holder or support 3|] are taken into consideration, since said coefficients are varying due to humidity, temperature and other climatic influences. Consequently the Yworkability of the writing device is improved and a. smooth operation thereof is assured. The upper and lower pairs of wire staples 25 serve further the purpose of forming upper and lower stops for the assembled intermediatelayers 29 which are capable of extend- ,ing somewhat in lengthwise direction.

As seen inV Figsjand 7, transparent top or cover plate 26 and base layer 24Vare alsoiirmly held together bytop and bottom edgings o r binding strips 42'! whichY prevent unraveling of the flexible layers forming the writing boardV or yunit 23. Said binding strips or edgings 2l have fur- 'ther the purpose of facilitating guiding of the Y stitutions and changes in the form and details of the device illustrated and the operation thereof may be made by those skilled in the'art without departing from the spirit of the invention.V

Having thus described theV invention what is claimedas new and desired to be secured by Letters Patent, is:

1; A'writing device ofthe character described comprising an elongated envelope having an open end, a front wall anda rear wall; said front wall being provided With-a cut-out forming a window,

`a writing unit arranged to slide through said open end of said envelope, .the surface oisaid unit being exposed to view at said window, a paperstrip interconnecting said writing unit with said envelope, said writing unit comprising a base `2. A writing device of the character described comprising an elongated flexible envelope havingan open end, the front wall of said envelope -being provided with a cut-out forming a window,

a, vwriting unit arranged to slide through said open end and exposed with its surface to view vat said window, a strip interconnecting said and displaceable within the confines -of said connecting means; said layers comprising a support, a tissue sheet overlying said support and fixed thereto, and a wax coating on said-support and positioned below said 4'tissue sheet; said strip transversely extending below said tissue sheet and above said wax coating and being provided said wax coating may be eiacedupon sliding movement of said writing unit Within said `envelope and past said strip. Y Y,

3. A writing device of the character described comprising an elongated envelope made of paper and having an open end, the front wall of V,said envelope being provided with a cut-out forming a window, a writing unit arranged to slide through said open end and exposed with its surface to View at said windowfa-pap'er strip interconnecting said writing unit `with said'envelope and positioned adjacent Vsaid vopen end, said writing unit comprising a base plate and a transparent cover, wire staplesuconnecting said cover to said base plate attheirrre'spective upper and lower edges, a plurality' of layers loosely interposed between said base plate and said cover` and displaceable between saidfupper and lower edges and within the contines of said wire staples, said layers comprising a, support, a'tissue sheet overlying said support and held thereon, and a Y `Wax coating on said support, said paper strip 70.

being positioned,v below said tissue sheet and above said wax coating and being provided with lateral extensions bent over the rear face of said V base plate,V adhesive meansxe'dly connecting said lateral extensions Yto'nthefrear wall at the .inside of said envelope,1whereby indicia caused lope, said successive layers comprising two outer layers and layers positioned intermediate said outer layers and including a thin sheet of translucent material arranged immediately below the uppermost layer of said unit, said uppermost layer being transparent, top edgings and bottom edgings, respectively, provided at the outer layers and binding the latter together, said Writing unit being exposed to view with a portion thereof at said window and being adapted to produce an indicia upon compressing said thin translucent sheet upon the layers therebelow, a strip extending transversely of said writing unit and disposed below said thin translucent sheet, and lateral extensions provided at said strip and projecting beyond said unit for attachment to a wall of said envelope within the interior of the latter whereby said thin translucent sheet may be separated from said layers therebelow by said strip upon sliding movement of said unit within said envelope.

5. A writing device of the character described comprising a ilexible envelope provided with a window, a writing unit having a plurality of successive layers and slidably arranged in said envelope, said successive layers comprising two outer layers and layers positioned intermediate said outer layers and including a thin sheet of translucent material arranged immediately below the uppermost layer of said unit, said uppermost layer being transparent, said writing unit being exposed to View with a portion thereof at said window and being adapted to produce an indicia upon compressing said thin translucent sheet upon the layers therebelow, a strip extending transversely of said writing unit and disposed below said thin translucent sheet, and lateral extensions provided at said strip and projecting beyond said unit for attachment to a wall of said envelope within the interior of the latter whereby said thin translucent sheet may be separated from said layers therebelow by said strip upon sliding movement of said unit within said envelope.

MARTIN BERLINER. ALFRED MATLAS. 

